<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login</title>
</head>
<body>
	建议用f12看一下整个请求到响应的过程<br>
	<form action="login" method="post"> 
	用户名：<input type="text" name="username"> <br> 
	密　码：<input type="password" name="password"> <br> 
	<input type="submit" value="登录"> 
	</form>
</body>
</html>